About 30km of its total length crosses the sea of the Pearl River delta. To allow ships through, a 6.7km section in the middle dips into an undersea tunnel that runs between two artificial islands.

The remaining sections are link roads, viaducts and land tunnels connecting Zhuhai and Hong Kong to the main bridge.

Why has it been built?

It is part of China’s plan to create a Greater Bay Area, including Hong Kong, Macau and nine other cities in southern China.

In the past, travelling between Zhuhai and Hong Kong would take up to four hours – the new bridge cuts this down to 30 minutes.

Can anyone drive across the bridge? No. Those who want to cross the bridge must obtain special permits, allocated by a quota system. And all vehicles will pay a toll.

The bridge is not served by public transport, so private shuttle buses will also ply the route. There is no rail link.

Authorities initially estimated that 9,200 vehicles would cross the bridge every day. They later lowered their estimations after new transport networks were built in the region.

What are people saying about it? There’s been a great deal of criticism of the project.

The bridge has been dubbed the “bridge of death” by some local media. At least nine workers on the Hong Kong side have died and officials told BBC News Chinese that nine had died on the mainland side, too.